deletions | additions       diff --git a/section_Multivariate_polynomials_on_bits__.tex b/section_Multivariate_polynomials_on_bits__.tex  index 18d79e0..ae5f7c2 100644  --- a/section_Multivariate_polynomials_on_bits__.tex  +++ b/section_Multivariate_polynomials_on_bits__.tex 
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Formally, a polynomial in the $2$ variables $x$ and $y$ and coefficients in $\Fb$ is any   expression of the form  $$  f(x,y)=\sum_{i,j \in \NN} a_{i,j} x^{i} {y}^{j} {y}^{\,j}  $$   such that  \begin{itemize}